Rim-fire ammunition for small-arms.



w. H. BU BLL. RIM FIRE AMMUNITION FOR SMALL ARMS.

APPLICATION rn-nn JUNE 20, 1910. i 66,163; Patented A152, 1910. w

\w id jr X i L J 1 w l.TN gs s Es UNITED srn rns PATENT ornion WILLIAM H. BUELL'OF'NEW HAVEN, cormncrrrcor, Assmnon r wmcnns'rnn REPEATIN G ARMS (30., OF NEW HAVEN, CONNECRIQUI, A. CORPORATION.

arm-Finn AMMUNITION non smart-emits.

aeaicej Specification of Letters Patent. I v PatehtGd Aug -2, 1910,-

Ap plicati on filed June'l20, 1916. Serial K0, 567,948;

To all whom it may concern: i

Be it known that I, WILLIAM H. BUELL, a citizen of the United States, residing at NewHaven, in the county of New Haven and State of Connecticut, have invented anew and useful Improvement in Rim-F ire Ammunition for Small-Arms; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon,

to his a full, clear, and exact description of the same, and which said drawings constitute part of this specification and represent a-vie'w partly in elevation and partly in See accordance with my invention.

My nvention relates to an improvement .tion of a rim-fire cartridge constructed in in rim-fire cartridges for .s'mall arms, the

object being to provide'iinproved means for confining the primer-mixture in place in the annular cavityof the rim of a rim-fire cartridge and to heighten the igniting and detonating force of the primer-mixture without decreasing its se'nsi'tivene'ss to the blowof" the hainnier'ofthe arm.

W ith these ends in .view my invention consists in rim-fire cartridge having certain 'detailsof construction andrombin'a l tions 'of parts asi-will be hereinafter described andpointed out in the claim.

In carrying out my invention as herein shown, I eniployfa drawn sheet-metal car 'tridge shell 2 having its head. 3 formed with an outwardly projecting annular hollow rim 3 l, the inwardly openlng-ca'vlty 50f which receives the prin1er-m1xture 6. For the re tention'of the primer-mixture, G-inplacein the cavity 5, Iemploy a binder 7 explosive by virtue of its chemical composition rather '40 than on account of. its being a mechanical mixture. After the primer-mixture 6: has been introduced into the cavity 5, the binder- .7 in the form of aviscous fluid is appl ed ,the exposed surface of the. mixture, to the, inner face of thehead 3 vand to the inner faces of those-portions of the side walls oflthe 'shell which areadjacentpto the said 'head'3 the said fluid being applied in suili-- .cient amount to form a continuous film' comp lete ly covering the exposed portions of the primer-mixture 6, the inner face of the head 3 and the" adjacent portions of the inner faces of the side Walls of the-shell 2,

so asato 'form'a complete and perfect seal 5 of cup-like form with thin edges, In other words; although the-binder 7 is applied in 'mixture from being displaced when the hammer ofthe arm strikes the rim'at the p the drawings. The said cup, furthermore, has suflicient body and strength to hold and confine the primer-mixture durpoint X on run after it has been ignited at one point b the falling of the hammer upon it. The binder 7 when, hardened, has smooth and continuous surfaces except where it makes contact with the plllllGY-IlllXt-HIB, at which points its surfaces will be somewhat incorbinder whenapphed is sufficiently fluidto find its way, as shown in the drawing, into the intersticesvof the outer layers of the particles forming the primeranixture; In preparing the binder, I preferably employ' an explosive-nitrate in a suitable liquid isolvent. I may, for instance, employ anyof the nitrates'of ellulosh, starch or sugar in a suitable solvent or any of the ex losive nivtro-derivatives of petroleum pro nets in a siiitable solvent. These eX-plosive nitrates Inaybe'dissolved in any solvents which may be found suitable for thepnrpose, such as amyl acetate, wood -alcohol, acetone, various forms of denatured alcohol, nitrobenzol e, nitro to-luol' or mixtures of these solvents with'each other, or with benzin or gasolene. The proportions of "explosive nitrate v and solvent willdepend upon thecharacter and strength of the materials employed as well as-the specific-requirementsof use in each instance, itonly being essential'that the explosive binder shall at the,;ti me of use have that degree ofviscosit'y which w ll permit the penetration of the binder into the outer "layer of the particles forming the pr merthat very slight dif ferences in the methods bf the form of a viscous fluid, when it is dry it has the form of acup firmly seated within- This cup has-not only time of firing the cartridge at about the porated with the primer-mixture since the mlxture. It-is impossible to state exact pro hollow rim 4 of the head 3 cartridges, but also to prevent the prirnerfing the interval required for the fire to; spread throughout the circumference of the of the nitrates in question, produce products which even when used in the same proportion, give different viscosities. But I have secured satisfactory results with a solution of a viscosity of 122 seconds plus or minus 10 seconds at 90 degrees Fahrenheit as taken by a Saybolt viscometer.

My improved product is not merely a varnishfor the condensation and confinement of the primer-mixture, but it is an explosive .binder, and being" explosive in its own character heightens the igniting and detonating force of the primer-mixture instead of im pairing it as is the case with the expedients before used. In my co-pending application filed May 23, 1910, Serial No. 563,002,I have shown and described the construction on a similar tridges.

I claim In a rim-fire cartridge for small arms, the combination with a drawn sheet-metal cartridge-shell having its head extended outplan, of a primer for center-fire carwardly to form an annular rim having an inwardly opening annular cavity, of a primer-mixture located within the said annular cavity of the rim, and an explosive binder coverin the inner face of the head of the said she] the exposed portions of the primer-mixture in the cavity of the rim of the shell and the inner faces of the adjacent portions of the side walls of the cartridge- 

